Some friends of ours have a baroud, http://www.jamesbaroudusa.com on top of their subaru. K and I have climbed around in it, and we are totally into getting one for the jeep. Light weight, solar-powered light and fan, self-ventilating and self-erecting... and they swear that the shell is aerodynamic enough that it doesn’t affect freeway driving. The hardshell versions, btw. Check ‘em out.